Out of curiosity, I just now calculated the reduction in mass moment of inertia for a typical scale model to help illustrate why scale models are so twitchy.
For a 1/6 scale model weighing somewhere in the range that we would typically fly, the mass moment of inertia in any one axis is approximately 1 / 8,000 of the full scale prototype. The reason for this drastic reduction is that the inertia scaling effect is a fifth order variable.
That's why these models ground loop in the blink of an eye.
Dick